How to mark common elements as checked in checkbox php array -


i have 2 arrays.
elements of second array $array2 displayed through check boxes.
want common elements of both lists marked checked , rest left unchecked.

$array1 = array("a", "b");  $array2 = array("a", "b", "c", "d"); 

$common = array_intersect($array1, $array2);  printf('<input type="checkbox" %s ...>', in_array('a', $common) ? 'checked' : null);

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